Football fans have grown tired of players acting like they're the referees and calling on actual match officials to brandish cards.
A growing trend among some footballers has seen the waving of imaginary cards become a staple of the game in recent times, and until referees book those stars for attempting to influence their decisions then it'll remain part and parcel of proceedings.
A tip of the hat to referee Damir Skomina, then, who cautioned Barcelona superstar Lionel Messi for doing just that in his side's eventual 3-0 Champions League victory over Juventus:
The diminutive wizard is seen asking Skomina to book I Bianconeri ace Miralem Pjanic for hauling him back and, despite Skomina giving Barca a free-kick, Messi demands more.
When the Argentine doesn't get his way, however, he very slightly grabs Skomina on the neck - a decision that didn't go down well with the man in charge - and was booked for his ongoing protestations.
In an era where match officials are criticised for getting things wrong, Skomina deserves praise for his actions. Kudos, sir!